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Personal finance, investing, and financial literacy.

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How accurately can complex option trades be signed? First grading against exchange truth

How accurately can complex option trades be signed? First grading against exchange truth

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2 min read
yfinance 1.6.0: Practical Python Stock Data, Live Streaming, and Equity Screening

yfinance 1.6.0: Practical Python Stock Data, Live Streaming, and Equity Screening

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4 min read
Why Most Tech Workers Get Hit With a Surprise RSU Tax Bill (And How to Fix It)

Why Most Tech Workers Get Hit With a Surprise RSU Tax Bill (And How to Fix It)

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2 min read
Is intraday momentum still alive? We measured it on 1,085 SPX sessions of the 0DTE era

Is intraday momentum still alive? We measured it on 1,085 SPX sessions of the 0DTE era

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2 min read
Does 0DTE options trading raise volatility? We measured a published +9% claim on 1,083 SPX sessions

Does 0DTE options trading raise volatility? We measured a published +9% claim on 1,083 SPX sessions

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2 min read
Does open interest pin the index or widen its range? A decomposition over 1,084 SPX sessions

Does open interest pin the index or widen its range? A decomposition over 1,084 SPX sessions

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2 min read
We replicated a published 0DTE options paper to four decimals. One unit-scale bug reverses its headline result — confirmed by the author

We replicated a published 0DTE options paper to four decimals. One unit-scale bug reverses its headline result — confirmed by the author

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3 min read
PSX Investor: A FastAPI Tool for Disciplined Stock Investing on the Pakistan Stock Exchange

PSX Investor: A FastAPI Tool for Disciplined Stock Investing on the Pakistan Stock Exchange

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8 min read
Designing a Discount-Validation API: Catching Stacked-Coupon Math Errors Before They Hit Production

Designing a Discount-Validation API: Catching Stacked-Coupon Math Errors Before They Hit Production

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6 min read
We open-sourced 449 real equipment financing quotes so nobody has to trust our math

We open-sourced 449 real equipment financing quotes so nobody has to trust our math

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2 min read
The Moving Average Awakens: A Star Wars Guide to RSI

The Moving Average Awakens: A Star Wars Guide to RSI

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5 min read
How late is Form 4 'real-time' data? Measuring filing delay on 11,241 insider filings

How late is Form 4 'real-time' data? Measuring filing delay on 11,241 insider filings

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3 min read
How accurate is the SPX "expected move"? A calibration over 1,088 sessions and 82,000 readings

How accurate is the SPX "expected move"? A calibration over 1,088 sessions and 82,000 readings

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2 min read
The ₹18 LPA that quietly became ₹1.1L a month

The ₹18 LPA that quietly became ₹1.1L a month

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3 min read
How much of the SPX options tape is dealer-to-dealer? A free daily floor from OCC data

How much of the SPX options tape is dealer-to-dealer? A free daily floor from OCC data

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3 min read
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